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Antagonistic ability of Streptomyces species from composite soil against pathogenic bacteria

A.A.Haleem Khan, Naseem, Shaziya Samreen

In this study five Streptomyces species were obtained fromcomposite soil sample. In vitro anti bacterial action of these isolates were checked for their inhibitory activities against pathogenic gram positive cocci (Staphylococcus aureus & Micrococcus luteus) and gram negative bacilli (Escherichia coli & Pseudomonas aeruginosa) by agar diffusion assay.Most of the Streptomyces species were highly active against grampositive cocci than gramnegative bacilli tested. Inhibition zones weremeasured to evaluate antagonistic activity towards the tested pathogenic bacteria. One isolate was inhibitory against the tested pathogens and the four other isolates were active on gram positive cocci.